1、Designation:E 1122 96(Reapproved 2002)Standard Practice forObtaining JK Inclusion Ratings Using Automatic ImageAnalysis1This standard is issued under the fixed designation E 1122;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the ye
2、ar of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon(e)indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1.Scope1.1 This practice covers procedures to
3、perform JK-typeinclusion ratings using automatic image analysis in accordancewith microscopical methods A and D of Practice E 45.1.2 This practice deals only with the recommended testmethods and nothing in it should be construed as defining orestablishing limits of acceptability for any grade of ste
4、el orother alloy where the method is appropriate.1.3 The values stated in SI units are to be regarded as thestandard.Values in parentheses are conversions and are ap-proximate.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibili
5、ty of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:E 3 Guide for Preparation of Metallographic Specimens2E 7 Terminology Relating to Metallography2E 45
6、Test Methods for Determining the Inclusion Contentof Steel2E 768 Practice for Preparing and Evaluating Specimens forAutomatic Inclusion Assessment of Steel2E 1245 Practice for Determining the Inclusion or Second-Phase Constituent Content of Metals by Automatic ImageAnalysis22.2 ASTM Adjuncts:Inclusi
7、ons in Steel,Plates I and III3Colored Plate Illustrating Use of DIC for Evaluating theQuality of Specimen Preparation43.Terminology3.1 DefinitionsFor definitions of terms used in this prac-tice,see Terminology E 7.3.2 Definitions of Terms Specific to This Standard:3.2.1 aspect ratiothe length-to-wid
8、th ratio of a micro-structural feature.3.2.2 discontinuous stringerthree or more inclusionsseparated by less than 40 m(0.0016 in.)that are aligned in aplane parallel to the hot-working axis.3.2.3 stringeran individual inclusion that is highly elon-gated in the deformation direction,or three or more
9、inclusionsseparated by less than 40 m(0.0016 in.)and aligned in thesame plane parallel to the deformation direction.3.2.4 threshold settingisolation of a range of gray levelvalues exhibited by one constituent in the microscope field.4.Summary of Practice4.1 The inclusions on the surface of a properl
10、y preparedas-polished metallographic specimen are viewed with a high-quality,metallurgical microscope.The bright-field image ispicked up by a suitable television camera and transferred to theimage analyzer screen.For the manual Method D in PracticeE 45,each 0.50-mm2test area is examined at 100X,clas
11、sifiedand rated before moving to the next contiguous field until atotal area of 160 mm2is covered.Using image analysis,the160-mm2area can be examined at any desired magnificationand field area.The inclusions are classified by type andthickness.Then,severity values are determined based upon therequir
12、ed 0.50-mm2field areas.Hence,with image analysis,theexamination field size may be larger or smaller than 0.50 mm2as long as the severity calculations are based on 0.50-mm2subdivisions of the 160-mm2total examination area.4.2 Inclusion types(A,B,C,and D in accordance withmicroscopical Practice E 45)a
13、re separated based on gray-leveldifferences and morphology.These inclusions are the indig-enous types resulting from the deoxidation of steel and theprecipitation of sulfide during solidification.Sulfides(Type A)are separated from oxides(Types B,C,and D)based on graylevel.All of the oxides are lower
14、 in light reflectivity than thesulfides.The oxides are separated based on morphology:Type1This practice is under the jurisdiction of ASTM Committee E04 on Metallog-raphy and is the direct responsibility of Subcommittee E04.09 on Inclusions.Current edition approved May 10,1996.Published July 1996.Ori
15、ginallypublished as E 1122 92.Last previous edition E 1122 96.2Annual Book of ASTM Standards,Vol 03.01.3Available from ASTM Headquarters.Order PCN 12-500450-01.4Available from ASTM Headquarters.Order PCN 12-507680-22.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,P
16、A 19428-2959,United States.Bdiscontinuous stringers;Type Csolid stringers;and TypeDnon-stringer,globular particles.4.3 Each inclusion type is further categorized as thin orthick(heavy)based on the thickness of the inclusions inaccordance with the limits in Table 1(Inclusion Width Param-eters(Method D)of Practice E 45.4.4 The inclusion rating numbers for thin and thick catego-ries of each inclusion type are calculated based on the totallength per field for Type A,the total stringer lengths per fi